# Rotational forces

1. Nov 28, 2004

### AeroFunk

A 50 kg child riding a farris wheel (radius= 10m) travels in a vertical circle. The wheel completes one revolution every 10 seconds. What is the magnitude of the force on the child by the seat at the highest point on the circlular path?

I found the Force due to gravity is mg = 490 N
and the force due to radial acceleration ar=(w^2)*R*m= 197.39 N

Is that all the forces I need to find, what exaclty do I do. Thanks for the help.

2. Nov 28, 2004

### Parth Dave

The force on the child by the seat would be the normal force. Essentially, you need to find how the magnitude of this force.

3. Nov 28, 2004

### AeroFunk

Yea i know, but the normal force would just be the oppisite of the sum of the forces "going down." Am I missing a force I need calculate or have I made a mistake?

4. Nov 28, 2004

### Sirus

I believe that since
$$F_{net}=F_{centripetal}$$,
$$F_{normal}=F_{centripetal}-F_{g}$$

5. Nov 28, 2004

### AeroFunk

thank you that worked